NOTE ON THE ILLUSTRATIONS. 



All the figures are photographic reproductions of drawings 

 by Mr. Wailes except when otherwise specified. The coloured 

 plates, Plates XXXV and XXXIX, and the text-figures, have 

 been executed by Messrs. Andre & Sleigh, Ltd. All the 

 other plates are collotype reproductions by Messrs. Griggs 

 & Sons, Ltd. 



